HREM Observations of Continuously Changing Intermediate Structures between f.c.c. and b.c.c. at the Austenite-Martensite Interface

K. Ogawa; T. Kikuchi; S. Kajiwara

doi:doi:10.1051/jp4:1997518

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Volume 07 / No C5 (November 1997)

J. Phys. IV France, 07 C5 (1997) C5-119-C5-124

Abstract

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Issue		J. Phys. IV France Volume 07, Number C5, November 1997 IV^th European Symposium on Martensitic Transformations


Page(s)		C5-119 - C5-124
DOI		https://doi.org/10.1051/jp4:1997518

IV^th European Symposium on Martensitic Transformations

J. Phys. IV France 07 (1997) C5-119-C5-124
DOI: 10.1051/jp4:1997518

HREM Observations of Continuously Changing Intermediate Structures between f.c.c. and b.c.c. at the Austenite-Martensite Interface

K. Ogawa, T. Kikuchi and S. Kajiwara

National Research Institute for Metals, 1-2-1 Sengen, Tsukuba 305, Japan

Abstract
Continuous lattice change from f.c.c. to b.c.c. as a function of subnanometric distance is observed near the austenite-martensite interface in an Fe-Ni-Mn alloy transformed isothermally at low temperature. From detailed analysis of such lattice changes, it is concluded that the lattice deformation proposed by Kurdjumov and Sachs is the most appropriate one. The Bogers-Burgers mechanism on which the Olson-Cohen nucleation model is based is found to be inadequate to explain the present observations.